Final answer:
Mississippian civil centers, notably Cahokia, were key urban settlements characterized by advanced societies and extensive mound complexes.
Explanation:
The most notable Mississippian civil centers were primarily located at Cahokia, which straddled the Mississippi River between St. Louis, Missouri, and East St. Louis, Illinois. Cahokia was the largest and most influential urban settlement of the Mississippian culture, with a peak population of approximately 40,000.
Cahokia was a key Mississippian center known for its vast complex of over 100 mounds and advanced societies. At its zenith, Cahokia covered nearly four square miles, hosting a population of up to 16,000 people, and featured a network of large mounds organized around a 100-foot-tall temple mound.
The Mississippian culture, renowned for its mound-building practices, utilized these earthworks for various purposes such as burial sites for the elite, centers of worship, and residences for the chiefdoms' leaders.
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